Additive manufacturing is an emergent manufacturing process capable of fabricating near net parts. However, powder bed metallic additive manufacturing is limited to small components. The inability to fabricate large structures (excess of 7 feet) is a significant challenge. Oak Ridge National Laboratory (ORNL) is extending the capabilities of metal additive manufacturing to the large scale. The process uses a robotic Metal Inert Gas (MIG) welding system. Despite the impressive capability of the system, the process is limited by the residual stresses (RS) and distortion. RS in these large-scale components are measured non-destructively using the NRSF2 strain scanning instrument at the High Flux Isotope Reactor at ORNL. The results are compared with models being developed at the Manufacturing Demonstration Facility (MDF) at ORNL.